On Mon, Apr 28, 2014 at 12:02 PM, Antoine Pitrou <solip...@pitrou.net>wrote:
> > On Mon, 28 Apr 2014 21:42:02 +0300 > Paul Sokolovsky <pmis...@gmail.com> wrote: > > > > > > Basically, if two classes have compatible layouts, you can inherit > > > from both at once. > > > > How is "compatible layout" defined? Or "layout" for that matter at > > all? > > See Guido's answer. I don't think it's documented anywhere, but you can > find the relevant code somewhere in Objects/typeobject.c (it's quite a > mouthful, though :-)). > > (IIRC, "layout" is determined by tp_basicsize, tp_itemsize, the > number of __slots__, and other things perhaps) > IIRC the actual inheritance pattern also goes into it. Two structs that each add an identical new field to a common base class's struct should *not* be considered compatible. -- --Guido van Rossum (python.org/~guido)
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